The thread would form a blob on the surface of the water. 3. Sprinkle black pepper over the surface of water in a Petri dish. What happens?
The pepper forms a “glob” on the surface of the water.
Why does the pepper sits in a glob/lump on top of the water?
The pepper is made up of non-polar molecules that don’t interact with the water but do interact with each other. The pepper initially clumps together to stay as far away from the water as possible and as close to the other pepper grains as possible.
Add a drop of detergent to the center of the Petri dish. What happens?